/Engine/Source/Runtime/HeadMountedDisplay/Public/IHeadMountedDisplay.h
This method is able to change screen settings right before any drawing occurs. It is called at the beginning ofUGameViewportClient::Draw()method. We might remove this one as UpdatePostProcessSettings should be able to capture all needed cases
virtual void UpdateScreenSettings ( const class [FViewport](API\Runtime\Engine\FViewport) * InViewport )